<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '','vcenter']" 
              v-for="(item1,i1) in scope.row.children" 
              :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable
                      @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" 
                      v-for="(item3,i3) in item2.children" 
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row,item3.id)"
                      >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>

            <!-- <pre>
              {{scope.row}}
            </pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree show-checkbox 
        :data="rightslist" 
        :props="treeProps" 
        node-key="id" 
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data(){
    return {
      // 所有角色列表数据
      rolelist:[],
      // 控制分配权限的对话框显示与隐藏
      setRightDialogVisible:false,
      // 所有权限的数据
      rightslist:[],
      // 树形控件的属性绑定对象
      treeProps:{
        label:'authName',
        children:'children'
      },
      // 默认选中的节点id值数组
      defKeys:[],
      // 当前即将分配权限的角色id
      roleId:''
    }
  },
  created(){
    this.getRolesList()
  },
  methods:{
    // 获取所有角色的列表
    async getRolesList(){
      const {data:res} = await this.$http.get('roles')
      if(res.meta.status !== 200){
        return this.$message.error('获取角色列表失败')
      }

      this.rolelist = res.data
      // console.log(this.rolelist)
    },
    // 根据id删除对应的权限
    async removeRightById(role,rightId){
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if(confirmResult !== 'confirm'){
        return this.$message.info('取消了删除')
      }

      const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

      if(res.meta.status !== 200){
        return this.$message.error('删除权限失败')
      }

      // this.getRolesList()
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role){
      this.roleId = role.id
      // 获取所有权限的数据
      const {data:res} = await this.$http.get('rights/tree')

      if(res.meta.status !== 200){
        return this.$message.error('获取权限数据失败')
      }

      // 把获取到的权限数据保存到data中
      this.rightslist = res.data
      console.log(this.rightslist)

      // 递归获取三级节点的id
      this.getLeafKeys(role,this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的行似，获取角色下所有三级权限的id，并保存到defKeys数组中
    getLeafKeys(node,arr){
      // 如果当前node节点不包含children属性，则是三级节点
      if(!node.children){
        return arr.push(node.id)
      }

      node.children.forEach(item => this.getLeafKeys(item,arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed(){
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights(){
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')

      const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
      
      if(res.meta.status !== 200){
        return this.$message.error('分配权限失败')
      }

      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag{
    margin: 7px;
  }

  .bdtop{
    border-top: 1px solid #eee;
  }
  .bdbottom{
     border-bottom: 1px solid #eee;
  }

  .vcenter{
    display:flex;
    align-items:center;
  }
</style>